With the present value of bitcoin and the future value being something bitcoiners feel will be beyond our imagination, even if donations were still collected, i don't think anyone will donate 50 or 10 BTC to the forum, they will surely hold it and contribute to the forum in other ways than donating.
Do we still have many consumers holding big amounts of BTC at the present price? I bet you that no one, if anyone, will send such a large amount of BTC to contribute to the forum right now. Bitcoin has surpassed people's expectations of what it would be in the last ten years. With what has occurred and what is to come, they'd rather wait for bitcoin's price to rise above its current level than use it for donations now. It now just takes a selfless heart to give out such a large sum.